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Rated 5 out of 5 stars
I have stopped using thunderbird 3 series due to the lack of this addon. I have about 30 folders, and this addon helped me keep track of conversations.
I tried the latest update (2 Apr) but it is not showing up as it used to do on TB 2 series.
Will try reinstalling thunderbird and recheck.
Thumbs up for this excellent addon.